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To clap on an erect penis or a vagina, whether your own or someone else's.
Guy 1: Dude, Susan came over last night and she japped me!

Guy 2: Dude, no way! That's so hot! I wish my girl would give me a japjab!

Guy 1: I wanted to jap her but she wouldn't let me.
by PepeSadforg August 14, 2015
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